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1 // Copyright 2005, Google Inc.
2 // All rights reserved.
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29 
30 // A sample program demonstrating using Google C++ testing framework.
31 //
32 // Author: wan@google.com (Zhanyong Wan)
33 
34 
35 // In this example, we use a more advanced feature of Google Test called
36 // test fixture.
37 //
38 // A test fixture is a place to hold objects and functions shared by
39 // all tests in a test case.  Using a test fixture avoids duplicating
40 // the test code necessary to initialize and cleanup those common
41 // objects for each test.  It is also useful for defining sub-routines
42 // that your tests need to invoke a lot.
43 //
44 // <TechnicalDetails>
45 //
46 // The tests share the test fixture in the sense of code sharing, not
47 // data sharing.  Each test is given its own fresh copy of the
48 // fixture.  You cannot expect the data modified by one test to be
49 // passed on to another test, which is a bad idea.
50 //
51 // The reason for this design is that tests should be independent and
52 // repeatable.  In particular, a test should not fail as the result of
53 // another test's failure.  If one test depends on info produced by
54 // another test, then the two tests should really be one big test.
55 //
56 // The macros for indicating the success/failure of a test
57 // (EXPECT_TRUE, FAIL, etc) need to know what the current test is
58 // (when Google Test prints the test result, it tells you which test
59 // each failure belongs to).  Technically, these macros invoke a
60 // member function of the Test class.  Therefore, you cannot use them
61 // in a global function.  That's why you should put test sub-routines
62 // in a test fixture.
63 //
64 // </TechnicalDetails>
65 
66 #include "sample3-inl.h"
67 #include "gtest/gtest.h"
68 
69 // To use a test fixture, derive a class from testing::Test.
70 class QueueTest : public testing::Test {
71  protected:  // You should make the members protected s.t. they can be
72              // accessed from sub-classes.
73 
74   // virtual void SetUp() will be called before each test is run.  You
75   // should define it if you need to initialize the varaibles.
76   // Otherwise, this can be skipped.
SetUp()77   virtual void SetUp() {
78     q1_.Enqueue(1);
79     q2_.Enqueue(2);
80     q2_.Enqueue(3);
81   }
82 
83   // virtual void TearDown() will be called after each test is run.
84   // You should define it if there is cleanup work to do.  Otherwise,
85   // you don't have to provide it.
86   //
87   // virtual void TearDown() {
88   // }
89 
90   // A helper function that some test uses.
Double(int n)91   static int Double(int n) {
92     return 2*n;
93   }
94 
95   // A helper function for testing Queue::Map().
MapTester(const Queue<int> * q)96   void MapTester(const Queue<int> * q) {
97     // Creates a new queue, where each element is twice as big as the
98     // corresponding one in q.
99     const Queue<int> * const new_q = q->Map(Double);
100 
101     // Verifies that the new queue has the same size as q.
102     ASSERT_EQ(q->Size(), new_q->Size());
103 
104     // Verifies the relationship between the elements of the two queues.
105     for ( const QueueNode<int> * n1 = q->Head(), * n2 = new_q->Head();
106           n1 != NULL; n1 = n1->next(), n2 = n2->next() ) {
107       EXPECT_EQ(2 * n1->element(), n2->element());
108     }
109 
110     delete new_q;
111   }
112 
113   // Declares the variables your tests want to use.
114   Queue<int> q0_;
115   Queue<int> q1_;
116   Queue<int> q2_;
117 };
118 
119 // When you have a test fixture, you define a test using TEST_F
120 // instead of TEST.
121 
122 // Tests the default c'tor.
TEST_F(QueueTest,DefaultConstructor)123 TEST_F(QueueTest, DefaultConstructor) {
124   // You can access data in the test fixture here.
125   EXPECT_EQ(0u, q0_.Size());
126 }
127 
128 // Tests Dequeue().
TEST_F(QueueTest,Dequeue)129 TEST_F(QueueTest, Dequeue) {
130   int * n = q0_.Dequeue();
131   EXPECT_TRUE(n == NULL);
132 
133   n = q1_.Dequeue();
134   ASSERT_TRUE(n != NULL);
135   EXPECT_EQ(1, *n);
136   EXPECT_EQ(0u, q1_.Size());
137   delete n;
138 
139   n = q2_.Dequeue();
140   ASSERT_TRUE(n != NULL);
141   EXPECT_EQ(2, *n);
142   EXPECT_EQ(1u, q2_.Size());
143   delete n;
144 }
145 
146 // Tests the Queue::Map() function.
TEST_F(QueueTest,Map)147 TEST_F(QueueTest, Map) {
148   MapTester(&q0_);
149   MapTester(&q1_);
150   MapTester(&q2_);
151 }
152